[philjohn]

Versions of OpenWRT are tied to different Kernel versions, it's an entire distro, not just a layer above the Kernel.

So the QCA NSS drivers, for example, are kernel modules. The source is fully open and available, but trying to get it to build on the 4.14.x kernel used by OpenWRT is an exercise in futility unless you know the linux networking code inside out, as well as understand what the drivers are doing.

Work is ongoing and some progress is being made for the IPQ8064, and some mediatek SoC's not have full hardware offloading, but taking vendor provided code and massaging it into something acceptable either by OpenWRT (they are loathe to do as it's a huge job) or the upstream Kernel is a huge effort.